Improvement in grinding-machines



s. F; REYNOLDS, l Grinding -M achines.

Patented Dec. 8,1874.

V Fig. 2

8mm msw,} I

UNITED STATES PATENT OEEIcE.

IMPROVEMENT IN GRINDING-MACHINES.

Specification forming part of Letters Patent N 0. 157,543, dated December 8, 1874; application filed October 7, 1874.

To all whom it may concern Be it known that I, SAMUEL F. REYNoLns, of Auburn, in the county of Cayuga and State of New York, have invented certain new and useful Improvements in Machines for Grinding Reaper and Mower Knives, Plane-Irons, and other cutting-instruments and that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings making a part of this specification, in which- Figure 1 represents a perspective view of the machine.

Fig. 2 represents a vertical .transverse section through the machine.

My invention relates to the manner in which I have arranged and combined the tables which hold and feed up the article to be ground to the grindstone, so that the stone shall not be unevenly worn, and to means for connecting and disconnecting the holding-table with a crank to give it a traversing motion across the stone.

To enable those skilled in the art to make and use my invention, I will proceed to desorIbe the same with reference to the drawing.

A represents the bed or frame upon which the stone and tables are placed and operated. The stone B is hung in suitable bearings, and is driven by a crank or pulley upon one end of its shaft a. On the bed or frame A is placed ways I) 1), upon which the under table 0 is moved and guided. This table 0 has a rack, c, on its under side, with which a pinion, e, on a crank-shaft, d, works, so that the op erator, by moving the crankshaft d, can move.

said table to and from the stone at pleasure. On dovetailed ways f on top of the table 0, but at right angles to the ways I) b on which said table 0 moves, is placed a second or upper table, D, upon which the holding mechanism g, which holds the reaper-knife or planeiron in proper position while being ground, is placed. At one end of the upper table D there is pivoted, as at h, a pitman, E, which has a recess, 1', in its outer end, that will take over and hold upon the long crank arm or rod F, so as to be reciprooated by said long crank F, and similarly reciprocate the table D across the under table 0 and the article to be ground, which is clamped on said table D. On the end of the shaft or, of the grindstone there is a bevel-pinion, j, which gears with and turns a bevel-wheel, G, fast upon the long crank F, so as to revolve said crank, and

through it to traverse the table or holder D past the face of the grindstone in a true line. Through hearings or supports on or in the under table 0 passes a rod, m, which has a roller, 'n, upon it, that, when advanced, rides up a plane, 1, on an arm, 8, attached to said under table, and underneath the pitman E, so that the operator may at any time raise or throw off the pitman from the long crank F, to stop the traverse of the table or holder D, and by pulling back said rod m the pitman will connect itself with said long crank by means of its recess 2'.

By connecting the rod m and roller n to and with the under table, instead of the upper one, D, with which it has especially to do, it prevents the upper table or holder from being skewed or strained, the doing of which tends to skew the article being ground, and so wear away the, stone unevenly.

As the stone wears away and diminishes in diameter, the tables and holder must be capable of being moved up to the stone, and for this purpose bearings 0 are made in the underways I) or upon the frame A, into any ofwhich the shaft (1, that moves through its pinion e the under table 0, can be placed and worked 5 and that the upper table or holder D may be reciprocated-in the changed position the long crank F is used, along which the pitman E is free to slide as said table or holder is moved up to the worn stone.

The power to move the article to be ground is connected with the power that drives the stone, and the article is moved uniformly across the face of the stone, thus making it an automatic or power machine.

The use of the two tables 0 D admits of the ways upon which the under table moves being so placed that the grit cannot get upon said ways and wear the table, or cause it to move unevenly.

Having thus fully described my invention, what I claim is In combination with the two tables 0 D and the pitman E, the rod and lifter-roller in or on the under table, to raise up and detach or let down and connect the pitman on the upper table, as and for the purpose described and represented.

SAMUEL F. REYNOLDS.

Witnesses:

E1). H. WELLEND, P. FRED DEERING. 

